package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     *新增菜品
     * @param dishDTO
     */
    @Transactional   //事务注解，保证事务是原子性的，要么全成功，要么全失败
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        //对象的属性拷贝,从前一个考入到后面的
        BeanUtils.copyProperties(dishDTO,dish);
        //向菜品表插入一条数据

        dishMapper.insert(dish);
        //获取insert生成的主键
        Long dishId = dish.getId();

        //向口味表插入一条或多条数据

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() >0){
            //匿名内部类的形式
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });

            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品分页查询
     * @param dto
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dto) {
        //根据pageHelp
        PageHelper.startPage(dto.getPage(),dto.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dto);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 菜品批量删除
     * @param ids
     */
    @Override
    @Transactional  //事务注解，保证事务是原子性的，要么全成功，要么全失败
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品能否删除，是否存在起售中的菜品
        ids.forEach(id ->{
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE){//状态值若为1，当前菜品处于起售中
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);//其手中的菜品不能删除
            }

        });
        //判断是否关联套餐,,,
        List<Long> setMealIds = setmealDishMapper.getSetMealIdsByDishIds(ids);
        if (setMealIds != null && setMealIds.size()>0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);//其手中的菜品不能删除
        }
        //删除菜品表中的菜品
        ids.forEach(id->{
            dishMapper.deleteById(id);
            //删除该菜品的口味
            dishFlavorMapper.deleteBuDishId(id);
        });
    }

    /**
     * 根据id来查询菜品以及口味数据
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        //查询到的数据直接封装到vo
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 根据id修改菜品的基本信息和口味信息
     * @param dishDTO
     */
    @Override
    public void updateWithDishFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品的基本信息
        dishMapper.update(dish);
        //删除口味信息
        dishFlavorMapper.deleteBuDishId(dish.getId());
        //增加新的口味信息
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() >0){
            //匿名内部类的形式
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dish.getId());
            });

            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 修改菜品起售停售
     * @param id
     */
    @Override
    public void UpdateStatus(Integer status, Long id) {
        Dish dish = Dish.builder()
                .status(status)
                .id(id)
                .build();
        dishMapper.update(dish);

    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }
}
